permanent paper
noun1
A type of acid-free paper designed for long-term storage, standardized as ISO 9706.
- A copy on permanent paper stored in a safe environment may preserve information for a very long time.2000, Rolf Dahlø, “The Rationale of Permanent Paper”, in Ralph W. Manning, Virginie Kremp, editors, A Reader in Preservation and Conservation, Walter de Gruyter, →ISBN, page 60:
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